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util/sha1.lua

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util/sha1.lua @ 224:7fc17e40fbaf

plugins.carbons: Add, implements Message Carbons (XEP 280)
author Kim Alvefur <zash@zash.se>
date Wed, 02 Nov 2011 01:17:54 +0100
parent 111:75c73ac9d5a6
child 486:6416ea3fff86
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
57
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1 -------------------------------------------------
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2 --- *** SHA-1 algorithm for Lua *** ---
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3 -------------------------------------------------
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4 --- Author: Martin Huesser ---
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5 --- Date: 2008-06-16 ---
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6 --- License: You may use this code in your ---
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7 --- projects as long as this header ---
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8 --- stays intact. ---
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9 -------------------------------------------------
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10
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11 local strlen = string.len
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12 local strchar = string.char
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13 local strbyte = string.byte
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14 local strsub = string.sub
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15 local floor = math.floor
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16 local bit = require "bit"
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17 local bnot = bit.bnot
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18 local band = bit.band
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19 local bor = bit.bor
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20 local bxor = bit.bxor
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21 local shl = bit.lshift
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22 local shr = bit.rshift
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23 local h0, h1, h2, h3, h4
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24
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25 -------------------------------------------------
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26
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27 local function LeftRotate(val, nr)
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28 return shl(val, nr) + shr(val, 32 - nr)
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29 end
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30
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31 -------------------------------------------------
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32
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33 local function ToHex(num)
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34 local i, d
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35 local str = ""
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36 for i = 1, 8 do
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37 d = band(num, 15)
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38 if (d < 10) then
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39 str = strchar(d + 48) .. str
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40 else
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41 str = strchar(d + 87) .. str
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42 end
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43 num = floor(num / 16)
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44 end
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45 return str
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46 end
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47
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48 -------------------------------------------------
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49
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50 local function PreProcess(str)
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51 local bitlen, i
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52 local str2 = ""
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53 bitlen = strlen(str) * 8
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54 str = str .. strchar(128)
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55 i = 56 - band(strlen(str), 63)
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56 if (i < 0) then
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57 i = i + 64
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58 end
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59 for i = 1, i do
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60 str = str .. strchar(0)
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61 end
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62 for i = 1, 8 do
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63 str2 = strchar(band(bitlen, 255)) .. str2
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64 bitlen = floor(bitlen / 256)
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65 end
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66 return str .. str2
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67 end
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68
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69 -------------------------------------------------
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70
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71 local function MainLoop(str)
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72 local a, b, c, d, e, f, k, t
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73 local i, j
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74 local w = {}
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75 while (str ~= "") do
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76 for i = 0, 15 do
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77 w[i] = 0
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78 for j = 1, 4 do
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79 w[i] = w[i] * 256 + strbyte(str, i * 4 + j)
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80 end
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81 end
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82 for i = 16, 79 do
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83 w[i] = LeftRotate(bxor(bxor(w[i - 3], w[i - 8]), bxor(w[i - 14], w[i - 16])), 1)
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84 end
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85 a = h0
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86 b = h1
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87 c = h2
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88 d = h3
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89 e = h4
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90 for i = 0, 79 do
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91 if (i < 20) then
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92 f = bor(band(b, c), band(bnot(b), d))
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93 k = 1518500249
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94 elseif (i < 40) then
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95 f = bxor(bxor(b, c), d)
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96 k = 1859775393
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97 elseif (i < 60) then
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98 f = bor(bor(band(b, c), band(b, d)), band(c, d))
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99 k = 2400959708
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100 else
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101 f = bxor(bxor(b, c), d)
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102 k = 3395469782
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103 end
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104 t = LeftRotate(a, 5) + f + e + k + w[i]
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105 e = d
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106 d = c
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107 c = LeftRotate(b, 30)
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108 b = a
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109 a = t
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110 end
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111 h0 = band(h0 + a, 4294967295)
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112 h1 = band(h1 + b, 4294967295)
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113 h2 = band(h2 + c, 4294967295)
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114 h3 = band(h3 + d, 4294967295)
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115 h4 = band(h4 + e, 4294967295)
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116 str = strsub(str, 65)
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117 end
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118 end
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119
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120 -------------------------------------------------
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121
105
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122 local function sha1(str, hexres)
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123 str = PreProcess(str)
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124 h0 = 1732584193
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125 h1 = 4023233417
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126 h2 = 2562383102
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127 h3 = 0271733878
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128 h4 = 3285377520
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129 MainLoop(str)
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130 local hex = ToHex(h0)..ToHex(h1)..ToHex(h2)
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131 ..ToHex(h3)..ToHex(h4);
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132 if hexres then
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133 return hex;
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134 else
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135 return (hex:gsub("..", function (byte)
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136 return string.char(tonumber(byte, 16));
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137 end));
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138 end
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139 end
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140
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141 _G.sha1 = {sha1 = sha1};
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142 return _G.sha1;
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143
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144 -------------------------------------------------
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145 -------------------------------------------------
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146 -------------------------------------------------